Computer Science
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33...36m&link_type=abstract
Earth and Planetary Science Letters, vol. 33, Nov. 1976, p. 36-44.
Computer Science
6
Carbonaceous Chondrites, Geochronology, Meteoritic Composition, Chemical Composition, Crystal Surfaces, Evolution (Development), Nuclear Fission, Olivine, Particle Tracks, Radioactive Age Determination, Solar System, Tables (Data)
Scientific paper
The times at which phyllosilicate matrix and euhedral olivines became associated have been determined for five C2 meteorites. The ages, calculated from fission track densities on crystal surfaces, are based on an initial Pu-244/U-238 ratio in the matrix material of 0.0154 at 4.6 b.y., and range from 4.22 b.y. for Nogoya to 4.42 b.y. for Murray. Unless the initial Pu-244/U-238 ratio was less than 0.004, the meteorites cannot have existed in their present form for 4.6 billion years. The measured ages place limits on the time when pre-compaction effects such as micrometeorite craters and solar flare tracks were produced, and they may approximately date the formation of the olivine crystals themselves.
Kothari Brajesh K.
Macdougall Douglas J.
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